The singer-actor had recently been admitted to the intensive care unit of a Fort Lauderdale, Florida, area hospital. Cassidy was in critical condition and suffering from organ failure before his death Tuesday, Geffen said.

"David died surrounded by those he loved, with joy in his heart and free from the pain that had gripped him for so long. Thank you for the abundance and support you have shown him these many years," she said.

Cassidy's nephew, Jack Cassidy, tweeted about his uncle's death, saying "I can't help but thank God for the joy that he brought to countless millions of people."